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Note 8 - Federal Home Loan Bank Advances (Details Textual) - Federal Home Loan Bank of Topeka [Member] - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2019
Oct. 31, 2024
Dec. 31, 2019
Dec. 31, 2024
FHLB Stock to be Purchased upon FHLB Borrowing, Percent       4.50%
Proceeds from FHLBank Borrowings, Financing Activities $ 1,000,000 $ 1,250,000    
Payments to Acquire Federal Home Loan Bank Stock $ 45,000      
Debt Instrument, Term   2 years    
Federal Home Loan Bank, Advance, Branch of FHLBank, Interest Rate   4.32% 1.66%  
Federal Home Loan Bank, Advance, Branch of FHLBank, Amount       $ 1,250,000
Mortgage Backed Securities and Us Treasuries [Member]        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged       $ 3,985,453
Federal Home Loan Bank Advances [Member]        
Debt Instrument, Term     10 years